[PATCH][X86] Remove AVX1 vbroadcast intrinsics

[Adam Nemet]

Hi,

This is a follow-on to the CFE patch that removes the use of these intrinsics from avxintrin.h (http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140526/106526.html).

These two patches remove the intrinsics from the backend and add auto-upgrade support for them.

There is more detailed comment in the individual patch files.

OK to commit?

Thanks,
Adam

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